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Same here (exact same output) with the SciFi Hallway demo on my radeon 6870 with r600 driver. Interestingly, the window title says GLSL 1.50 which is a OpenGL 3.2 requirement which again should be fully supported. Dunno why it does not work.

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I suppose at moment you have no chance to see it work properly with open source drivers because it's don't even work on Intel and one of guys on reddit said there is some problem with shader converted so it's trying to use GLSL 4.0 features while game using 3.2 context. This looks like works on blobs, but not with Mesa.